题目

—The moment I saw him, he began to________about the bad weather he had while traveling there.—He must have had a very unpleasant journey there. A . complain B . compensate C . compromise D . explain 答案：A下列关于氧气的说法错误的是A. 空气中的氧气主要来自于植物的光合作用B. 通常状况下，氧气的密度略大于空气C. 带火星的木条一定能在含有氧气的集气瓶中复燃D. 水中的生物能依靠溶于水中的少量氧气而生存